/* =========================================================
   DESIGN SYSTEM
========================================================= */

:root {

    --green-950: #062d27;
    --green-900: #073b33;
    --green-800: #0a4a40;
    --green-700: #096052;
    --green-600: #0b7563;
    --green-500: #15947c;

    --mint-50: #f1faf7;
    --mint-100: #e5f5f0;

    --blue-500: #2563eb;

    --text: #17211f;
    --muted: #66736f;

    --line: #dce5e2;
    --line-dark: #c8d4d0;

    --surface: #ffffff;
    --surface-soft: #f7faf9;
    --page: #f4f7f6;

    --danger: #b42318;
    --danger-bg: #fff4f2;

    --success: #087443;
    --success-bg: #eefbf4;

    --warning: #9a6700;
    --warning-bg: #fff9e9;

    --radius: 18px;
    --radius-sm: 12px;

    --shadow:
        0 18px 55px
        rgba(7, 59, 51, .09);
}


/* =========================================================
   RESET
========================================================= */

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {

    margin: 0;

    background:
        linear-gradient(
            180deg,
            #f8fbfa 0%,
            #f3f7f5 100%
        );

    color: var(--text);

    font-family:
        Inter,
        ui-sans-serif,
        system-ui,
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        sans-serif;

    line-height: 1.55;
}

button,
input,
textarea,
select {

    font: inherit;
}

button,
a {

    -webkit-tap-highlight-color:
        transparent;
}

a {

    color: inherit;
    text-decoration: none;
}


/* =========================================================
   TOP BAR
========================================================= */

.topbar {

    position: sticky;
    top: 0;
    z-index: 100;

    height: 68px;

    display: flex;
    align-items: center;

    background:
        rgba(255,255,255,.94);

    border-bottom:
        1px solid rgba(210,222,218,.85);

    backdrop-filter:
        blur(16px);
}

.topbar-inner {

    width:
        min(
            1180px,
            calc(100% - 40px)
        );

    margin: auto;

    display: flex;
    align-items: center;
    justify-content: space-between;

    gap: 20px;
}

.brand {

    display: flex;
    align-items: center;

    gap: 11px;

    font-weight: 850;
}

.brand-mark {

    width: 38px;
    height: 38px;

    border-radius: 11px;

    display: grid;
    place-items: center;

    background:
        linear-gradient(
            135deg,
            var(--green-700),
            var(--green-500)
        );

    color: #fff;

    font-size: 14px;
    font-weight: 900;

    box-shadow:
        0 8px 22px
        rgba(9,96,82,.22);
}

.brand-text {

    line-height: 1.05;
}

.brand-text strong {

    display: block;

    font-size: 14px;

    letter-spacing: -.2px;
}

.brand-text span {

    display: block;

    margin-top: 3px;

    color: var(--muted);

    font-size: 10px;

    font-weight: 650;

    letter-spacing: .08em;

    text-transform: uppercase;
}

.back-link {

    display: inline-flex;
    align-items: center;
    gap: 7px;

    padding: 9px 13px;

    border:
        1px solid var(--line);

    border-radius: 10px;

    background: #fff;

    color: var(--green-800);

    font-size: 12px;
    font-weight: 750;

    transition: .2s ease;
}

.back-link:hover {

    border-color:
        var(--green-500);

    transform:
        translateY(-1px);
}


/* =========================================================
   PAGE
========================================================= */

.page {

    width:
        min(
            1180px,
            calc(100% - 40px)
        );

    margin: 0 auto;

    padding:
        38px 0 70px;
}


/* =========================================================
   EVENT HEADER
========================================================= */

.event-header {

    position: relative;

    overflow: hidden;

    min-height: 260px;

    display: flex;
    align-items: flex-end;

    margin-bottom: 28px;

    border-radius: 24px;

    background:
        linear-gradient(
            135deg,
            var(--green-950),
            var(--green-700)
        );

    box-shadow:
        0 22px 70px
        rgba(6,45,39,.18);
}

.event-header-image {

    position: absolute;
    inset: 0;

    width: 100%;
    height: 100%;

    object-fit: cover;

    opacity: .30;
}

.event-header-overlay {

    position: absolute;
    inset: 0;

    background:
        linear-gradient(
            90deg,
            rgba(3,30,26,.95),
            rgba(6,60,51,.70),
            rgba(6,60,51,.30)
        );
}

.event-header-content {

    position: relative;
    z-index: 2;

    padding: 35px;

    width: 100%;
}

.event-label {

    display: inline-flex;

    margin-bottom: 12px;

    padding: 6px 10px;

    border:
        1px solid
        rgba(255,255,255,.18);

    border-radius: 999px;

    background:
        rgba(255,255,255,.09);

    color:
        rgba(255,255,255,.82);

    font-size: 10px;

    font-weight: 850;

    letter-spacing: .12em;

    text-transform: uppercase;
}

.event-header h1 {

    max-width: 820px;

    margin: 0;

    color: #fff;

    font-size:
        clamp(27px, 4vw, 46px);

    line-height: 1.08;

    letter-spacing: -.035em;
}

.event-short {

    max-width: 760px;

    margin:
        13px 0 0;

    color:
        rgba(255,255,255,.76);

    font-size: 14px;
}

.event-meta {

    display: flex;
    flex-wrap: wrap;

    gap: 8px;

    margin-top: 20px;
}

.event-meta-item {

    padding: 8px 11px;

    border-radius: 9px;

    background:
        rgba(255,255,255,.10);

    color:
        rgba(255,255,255,.88);

    font-size: 11px;

    font-weight: 650;
}


/* =========================================================
   MAIN LAYOUT
========================================================= */

.registration-layout {

    display: grid;

    grid-template-columns:
        minmax(0, 1fr)
        330px;

    gap: 26px;

    align-items: start;
}


/* =========================================================
   FORM CARD
========================================================= */

.form-card {

    overflow: hidden;

    border:
        1px solid var(--line);

    border-radius: var(--radius);

    background:
        var(--surface);

    box-shadow:
        var(--shadow);
}


/* =========================================================
   FORM INTRO
========================================================= */

.form-intro {

    padding:
        28px 30px 23px;

    border-bottom:
        1px solid var(--line);
}

.form-intro h2 {

    margin: 0;

    font-size: 24px;

    letter-spacing: -.025em;
}

.form-intro p {

    margin:
        7px 0 0;

    color: var(--muted);

    font-size: 13px;
}


/* =========================================================
   ALERTS
========================================================= */

.alert {

    margin:
        20px 30px 0;

    padding:
        14px 15px;

    border-radius: 12px;

    font-size: 13px;

    font-weight: 650;
}

.alert-error {

    color: var(--danger);

    background: var(--danger-bg);

    border:
        1px solid #f3c8c3;
}

.alert-success {

    color: var(--success);

    background: var(--success-bg);

    border:
        1px solid #bfe6cf;
}


/* =========================================================
   FORM SECTIONS
========================================================= */

.form-section {

    padding:
        28px 30px;

    border-bottom:
        1px solid var(--line);
}

.form-section:last-of-type {

    border-bottom: 0;
}

.section-heading {

    display: flex;
    align-items: flex-start;

    gap: 13px;

    margin-bottom: 21px;
}

.section-number {

    flex: 0 0 auto;

    width: 32px;
    height: 32px;

    display: grid;
    place-items: center;

    border-radius: 10px;

    background:
        var(--mint-100);

    color:
        var(--green-700);

    font-size: 11px;

    font-weight: 900;
}

.section-heading h3 {

    margin: 0;

    font-size: 17px;

    letter-spacing: -.015em;
}

.section-heading p {

    margin: 3px 0 0;

    color: var(--muted);

    font-size: 12px;
}


/* =========================================================
   GRID
========================================================= */

.field-grid {

    display: grid;

    grid-template-columns:
        repeat(2, minmax(0, 1fr));

    gap: 18px;
}

.field-grid.three {

    grid-template-columns:
        150px
        minmax(0, 1fr)
        minmax(0, 1fr);
}

.field-full {

    grid-column:
        1 / -1;
}


/* =========================================================
   FIELD
========================================================= */

.form-group {

    min-width: 0;
}

.form-group label {

    display: flex;
    align-items: center;
    gap: 6px;

    margin-bottom: 7px;

    color: #26322f;

    font-size: 12px;

    font-weight: 800;
}

.required {

    color: #c6372d;
}

.optional {

    color: var(--muted);

    font-size: 10px;

    font-weight: 600;
}

.form-control {

    width: 100%;

    min-height: 47px;

    padding:
        11px 13px;

    border:
        1px solid var(--line-dark);

    border-radius: 11px;

    background: #fff;

    color: var(--text);

    outline: none;

    transition:
        border-color .18s ease,
        box-shadow .18s ease,
        background .18s ease;
}

.form-control:hover {

    border-color:
        #aebfba;
}

.form-control:focus {

    border-color:
        var(--green-500);

    box-shadow:
        0 0 0 4px
        rgba(21,148,124,.10);
}

textarea.form-control {

    min-height: 180px;

    resize: vertical;

    line-height: 1.65;
}

select.form-control {

    cursor: pointer;
}

.field-help {

    margin-top: 6px;

    color: var(--muted);

    font-size: 10.5px;

    line-height: 1.45;
}


/* =========================================================
   LICENSE FIELD
========================================================= */

#licenseField {

    display: none;
}

#licenseField.visible {

    display: block;
}


/* =========================================================
   ABSTRACT
========================================================= */

.abstract-section {

    background:
        linear-gradient(
            180deg,
            #fbfefd 0%,
            #f6fbf9 100%
        );
}

.abstract-top {

    margin-bottom: 22px;

    padding:
        15px 16px;

    border:
        1px solid #cce6df;

    border-radius: 13px;

    background:
        #f0faf7;
}

.abstract-top-row {

    display: flex;
    flex-wrap: wrap;

    gap: 7px;
}

.abstract-chip {

    display: inline-flex;

    align-items: center;

    padding:
        7px 9px;

    border-radius: 8px;

    background: #fff;

    border:
        1px solid #d5e9e4;

    color:
        var(--green-800);

    font-size: 10px;

    font-weight: 800;
}

.abstract-note {

    margin:
        10px 0 0;

    color:
        #52645f;

    font-size: 11px;
}

.abstract-closed {

    padding:
        15px 16px;

    border:
        1px solid #f1d99c;

    border-radius: 12px;

    background:
        var(--warning-bg);

    color:
        #765200;

    font-size: 12px;

    font-weight: 650;
}

.word-counter {

    display: flex;
    align-items: center;
    justify-content: space-between;

    margin-top: 7px;

    color: var(--muted);

    font-size: 10.5px;
}

.word-counter strong {

    color:
        var(--green-700);
}

.word-counter.over-limit strong {

    color:
        var(--danger);
}


/* =========================================================
   PRESENTATION CARDS
========================================================= */

.presentation-grid {

    display: grid;

    grid-template-columns:
        repeat(
            auto-fit,
            minmax(130px, 1fr)
        );

    gap: 10px;
}

.presentation-option {

    position: relative;
}

.presentation-option input {

    position: absolute;

    opacity: 0;

    pointer-events: none;
}

.presentation-option label {

    display: flex;

    align-items: center;
    justify-content: center;

    min-height: 50px;

    margin: 0;

    padding: 10px 13px;

    border:
        1px solid var(--line-dark);

    border-radius: 11px;

    background: #fff;

    color: #384641;

    text-align: center;

    cursor: pointer;

    font-size: 12px;
    font-weight: 750;

    transition: .18s ease;
}

.presentation-option label:hover {

    border-color:
        var(--green-500);

    color:
        var(--green-700);
}

.presentation-option input:checked + label {

    border-color:
        var(--green-600);

    background:
        var(--mint-100);

    color:
        var(--green-800);

    box-shadow:
        inset 0 0 0 1px
        var(--green-500);
}


/* =========================================================
   FILE UPLOAD
========================================================= */

.file-box {

    padding:
        16px;

    border:
        1px dashed #a9c8c0;

    border-radius: 13px;

    background:
        #f8fcfb;
}

.file-box input[type="file"] {

    width: 100%;

    padding:
        10px;

    border:
        1px solid var(--line);

    border-radius: 9px;

    background: #fff;

    color: var(--muted);

    font-size: 12px;
}

.file-info {

    display: flex;
    flex-wrap: wrap;

    gap: 7px;

    margin-top: 9px;

    color: var(--muted);

    font-size: 10.5px;
}


/* =========================================================
   PAYMENT
========================================================= */

.payment-section {

    background:
        #fcfdfd;
}

.payment-layout {

    display: grid;

    grid-template-columns:
        minmax(200px, .8fr)
        minmax(0, 1.2fr);

    gap: 20px;

    align-items: start;
}

.qr-card {

    padding: 15px;

    border:
        1px solid var(--line);

    border-radius: 14px;

    background: #fff;

    text-align: center;
}

.qr-card img {

    display: block;

    width:
        min(
            100%,
            230px
        );

    aspect-ratio: 1;

    object-fit: contain;

    margin: 0 auto;

    border-radius: 10px;
}

.qr-caption {

    margin-top: 9px;

    color: var(--muted);

    font-size: 10.5px;
}

.payment-reminder {

    margin-bottom: 16px;

    padding:
        13px 14px;

    border:
        1px solid #cfe4ff;

    border-radius: 11px;

    background: #f4f8ff;

    color: #315071;

    font-size: 11px;

    line-height: 1.5;
}


/* =========================================================
   SUMMARY
========================================================= */

.registration-summary {

    padding:
        20px 30px;

    background:
        var(--surface-soft);

    border-top:
        1px solid var(--line);
}

.summary-title {

    margin-bottom: 12px;

    color: #42504c;

    font-size: 10px;

    font-weight: 850;

    letter-spacing: .10em;

    text-transform: uppercase;
}

.summary-grid {

    display: grid;

    grid-template-columns:
        repeat(3, minmax(0, 1fr));

    gap: 10px;
}

.summary-item {

    padding:
        11px 12px;

    border:
        1px solid var(--line);

    border-radius: 10px;

    background: #fff;
}

.summary-item span {

    display: block;

    color: var(--muted);

    font-size: 9px;

    font-weight: 700;

    text-transform: uppercase;

    letter-spacing: .06em;
}

.summary-item strong {

    display: block;

    margin-top: 2px;

    color: var(--green-800);

    font-size: 12px;
}


/* =========================================================
   SUBMIT
========================================================= */

.form-submit {

    padding:
        22px 30px 28px;
}

.submit-button {

    width: 100%;

    min-height: 54px;

    border: 0;

    border-radius: 13px;

    background:
        linear-gradient(
            135deg,
            var(--green-700),
            var(--green-500)
        );

    color: #fff;

    font-size: 13px;

    font-weight: 850;

    letter-spacing: .01em;

    cursor: pointer;

    box-shadow:
        0 12px 28px
        rgba(9,96,82,.20);

    transition: .2s ease;
}

.submit-button:hover:not(:disabled) {

    transform:
        translateY(-1px);

    box-shadow:
        0 15px 32px
        rgba(9,96,82,.25);
}

.submit-button:disabled {

    opacity: .65;

    cursor: wait;
}

.submit-note {

    margin-top: 9px;

    color: var(--muted);

    font-size: 10px;

    text-align: center;
}


/* =========================================================
   SIDEBAR
========================================================= */

.sidebar {

    position: sticky;

    top: 92px;

    display: grid;

    gap: 15px;
}

.side-card {

    padding: 21px;

    border:
        1px solid var(--line);

    border-radius: var(--radius);

    background: #fff;

    box-shadow:
        0 14px 40px
        rgba(7,59,51,.06);
}

.side-card h3 {

    margin: 0 0 14px;

    font-size: 15px;

    letter-spacing: -.015em;
}

.side-event {

    padding-bottom: 15px;

    margin-bottom: 15px;

    border-bottom:
        1px solid var(--line);
}

.side-event strong {

    display: block;

    color: var(--green-800);

    font-size: 13px;

    line-height: 1.4;
}

.side-detail {

    display: flex;

    gap: 10px;

    padding: 9px 0;

    color: #45534f;

    font-size: 11px;
}

.side-icon {

    flex: 0 0 auto;

    width: 25px;
    height: 25px;

    display: grid;
    place-items: center;

    border-radius: 7px;

    background:
        var(--mint-100);

    color:
        var(--green-700);

    font-size: 11px;
}

.deadline-box {

    padding:
        13px;

    border-radius: 11px;

    background:
        var(--mint-50);

    border:
        1px solid #d2e9e3;

    color:
        var(--green-800);

    font-size: 11px;
}

.deadline-box strong {

    display: block;

    margin-top: 3px;

    font-size: 13px;
}

.abstract-status {

    padding:
        13px;

    border-radius: 11px;

    background:
        #f7faf9;

    border:
        1px solid var(--line);

    font-size: 11px;

    color: #485752;
}

.abstract-status strong {

    display: block;

    margin-bottom: 3px;

    color: var(--green-800);

    font-size: 12px;
}


/* =========================================================
   FOOTER
========================================================= */

.footer {

    padding:
        30px 20px;

    background:
        var(--green-950);

    color:
        rgba(255,255,255,.60);

    text-align: center;

    font-size: 10px;
}


/* =========================================================
   RESPONSIVE
========================================================= */

@media (max-width: 950px) {

    .registration-layout {

        grid-template-columns:
            1fr;
    }

    .sidebar {

        position: static;

        grid-template-columns:
            repeat(2, minmax(0,1fr));
    }
}


@media (max-width: 700px) {

    .page {

        width:
            min(
                100% - 24px,
                620px
            );

        padding-top: 18px;
    }

    .topbar {

        height: 62px;
    }

    .topbar-inner {

        width:
            calc(100% - 24px);
    }

    .brand-text span {

        display: none;
    }

    .event-header {

        min-height: 300px;

        border-radius: 18px;
    }

    .event-header-content {

        padding: 25px 22px;
    }

    .form-intro,
    .form-section {

        padding:
            23px 20px;
    }

    .form-submit,
    .registration-summary {

        padding-left: 20px;
        padding-right: 20px;
    }

    .alert {

        margin-left: 20px;
        margin-right: 20px;
    }

    .field-grid,
    .field-grid.three {

        grid-template-columns: 1fr;
    }

    .payment-layout {

        grid-template-columns: 1fr;
    }

    .summary-grid {

        grid-template-columns:
            1fr;
    }

    .sidebar {

        grid-template-columns: 1fr;
    }
}


@media (max-width: 430px) {

    .page {

        width:
            calc(100% - 16px);
    }

    .event-header {

        border-radius: 15px;
    }

    .event-header h1 {

        font-size: 27px;
    }

    .form-intro h2 {

        font-size: 21px;
    }

    .form-section {

        padding:
            21px 16px;
    }

    .form-submit,
    .registration-summary {

        padding-left: 16px;
        padding-right: 16px;
    }

    .alert {

        margin-left: 16px;
        margin-right: 16px;
    }

    .event-meta {

        display: grid;

        grid-template-columns: 1fr;
    }

    .event-meta-item {

        width: fit-content;
    }
}
/* =========================================================
   PREMIUM ENHANCEMENTS
   Keeps content and functionality unchanged
========================================================= */

.page {
    animation: pageFadeUp .5s ease;
}

@keyframes pageFadeUp {
    from {
        opacity: 0;
        transform: translateY(18px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.event-header {
    position: relative;
    overflow: hidden;
    box-shadow: 0 24px 60px rgba(7, 20, 33, .10);
}

.event-header::after {
    content: "";
    position: absolute;
    inset: 0;
    background:
        linear-gradient(
            135deg,
            rgba(8, 118, 201, .08),
            rgba(255,255,255,0)
        );
    pointer-events: none;
}

.form-card,
.info-card,
.summary-card,
.payment-card,
.abstract-card,
.note-card {
    transition:
        transform .28s ease,
        box-shadow .28s ease,
        border-color .28s ease;
}

.form-card:hover,
.info-card:hover,
.summary-card:hover,
.payment-card:hover,
.abstract-card:hover,
.note-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 18px 45px rgba(7, 20, 33, .09);
}

.form-control,
select,
textarea,
input[type="text"],
input[type="email"],
input[type="number"],
input[type="tel"],
input[type="file"] {
    transition:
        border-color .25s ease,
        box-shadow .25s ease,
        transform .2s ease;
}

.form-control:focus,
select:focus,
textarea:focus,
input[type="text"]:focus,
input[type="email"]:focus,
input[type="number"]:focus,
input[type="tel"]:focus,
input[type="file"]:focus {
    transform: translateY(-1px);
    box-shadow: 0 0 0 4px rgba(8,118,201,.08);
}

button,
.submit-btn,
.pay-btn,
.action-btn {
    transition:
        transform .25s ease,
        box-shadow .25s ease,
        opacity .25s ease;
}

button:hover,
.submit-btn:hover,
.pay-btn:hover,
.action-btn:hover {
    transform: translateY(-2px);
}

.section-heading,
.card-heading {
    position: relative;
}

.section-heading::after,
.card-heading::after {
    content: "";
    display: block;
    width: 56px;
    height: 3px;
    margin-top: 10px;
    border-radius: 999px;
    background: linear-gradient(90deg, #0876c9, #40a7ee);
}

.field-grid > *,
.form-grid > * {
    animation: fieldFade .45s ease both;
}

.field-grid > *:nth-child(1),
.form-grid > *:nth-child(1) { animation-delay: .02s; }
.field-grid > *:nth-child(2),
.form-grid > *:nth-child(2) { animation-delay: .05s; }
.field-grid > *:nth-child(3),
.form-grid > *:nth-child(3) { animation-delay: .08s; }
.field-grid > *:nth-child(4),
.form-grid > *:nth-child(4) { animation-delay: .11s; }

@keyframes fieldFade {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation: none !important;
        transition: none !important;
    }
}
/* Larger, darker selected filename */
.file-box input[type="file"] {
    width: 100%;
    max-width: 100%;
    height: auto;
    min-height: 58px;
    padding: 10px;
    font-size: 18px !important;
    font-weight: 600;
    line-height: 1.5;
    color: #023337 !important;
    background: #fff;
}

/* Compact button leaves more space for the filename */
.file-box input[type="file"]::file-selector-button {
    padding: 10px 12px;
    margin-right: 10px;
    border: 0;
    border-radius: 8px;
    background: #023337;
    color: #fff;
    font-size: 14px;
    font-weight: 700;
    cursor: pointer;
}