/* ==========================================================
   COGNOS 2K26 - Comprehensive Responsive Stylesheet
   Ensures seamless responsiveness across Mobile, Tablet, and Desktop
   ========================================================== */

/* Universal Responsive Fixes & Box Model */
*, *::before, *::after {
    box-sizing: border-box;
}

html, body {
    max-width: 100%;
    overflow-x: hidden;
}

/* ----------------------------------------------------------
   1. LAPTOPS & TABLETS (max-width: 1024px)
   ---------------------------------------------------------- */
@media (max-width: 1024px) {
    .container {
        padding: 0 20px;
    }

    .hero-title {
        font-size: 64px;
    }

    .events-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }

    .hero-meta-cards {
        grid-template-columns: repeat(3, 1fr);
        gap: 16px;
    }

    .gallery-photo-card {
        flex: 0 0 300px;
        height: 210px;
    }
}

/* ----------------------------------------------------------
   2. TABLETS & SMALL DESKTOPS (max-width: 992px)
   ---------------------------------------------------------- */
@media (max-width: 992px) {
    .hero-meta-cards {
        grid-template-columns: 1fr;
        max-width: 540px;
        margin-left: auto;
        margin-right: auto;
    }

    .events-grid {
        grid-template-columns: 1fr;
        max-width: 600px;
        margin-left: auto;
        margin-right: auto;
    }

    .coordinators-grid {
        grid-template-columns: 1fr;
        max-width: 600px;
        margin-left: auto;
        margin-right: auto;
    }

    .footer-top {
        grid-template-columns: 1fr;
        gap: 32px;
    }
}

/* ----------------------------------------------------------
   3. MOBILE & SMALL TABLETS (max-width: 768px)
   ---------------------------------------------------------- */
@media (max-width: 768px) {
    /* Header & Navigation */
    .top-header-banner {
        padding: 8px 12px;
    }

    .college-header-logo {
        max-height: 54px;
    }

    .main-navbar .nav-container {
        position: relative;
        min-height: 48px;
    }

    .mobile-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
        background: rgba(255, 255, 255, 0.15);
        border: 1px solid rgba(255, 255, 255, 0.28);
        border-radius: 6px;
        padding: 8px 10px;
        color: #ffffff;
        cursor: pointer;
        transition: background 0.2s ease;
    }

    .mobile-toggle:hover {
        background: rgba(255, 255, 255, 0.25);
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: linear-gradient(180deg, #123a8c 0%, #0c2760 100%);
        flex-direction: column;
        padding: 16px 20px 22px;
        gap: 6px;
        box-shadow: 0 16px 30px rgba(0, 0, 0, 0.35);
        z-index: 1500;
        border-bottom: 2px solid #38bdf8;
    }

    .nav-links.show,
    .nav-links.active {
        display: flex !important;
    }

    .nav-links li {
        width: 100%;
    }

    .nav-link {
        display: block;
        width: 100%;
        padding: 11px 16px;
        border-radius: 6px;
        font-size: 15px;
        color: #ffffff;
        text-align: left;
    }

    .btn-nav-register {
        display: block;
        width: 100%;
        margin: 10px 0 0 0;
        padding: 12px;
        font-size: 15px;
        text-align: center;
        background: #ffffff;
        color: var(--header-blue) !important;
    }

    /* Hero Section */
    .hero-section {
        padding: 36px 0 44px 0;
    }

    .hero-department-block {
        gap: 3px;
        padding: 0 8px;
    }

    .organizer-kicker {
        font-size: 14px;
    }

    .department-label {
        font-size: 16px;
    }

    .department-name {
        font-size: 16px;
        line-height: 1.35;
        text-align: center;
        max-width: 100%;
    }

    .department-connector {
        font-size: 14px;
    }

    .hero-title {
        font-size: 48px;
        margin: 14px 0 8px 0;
    }

    .hero-tagline {
        font-size: 20px;
        margin-bottom: 22px;
    }

    .hero-meta-card {
        padding: 14px 16px;
        border-radius: 10px;
    }

    .countdown-grid {
        gap: 8px;
        max-width: 360px;
    }

    .countdown-box {
        padding: 10px 4px;
        border-radius: 8px;
    }

    .countdown-num {
        font-size: 26px;
    }

    .countdown-label {
        font-size: 11px;
    }

    .hero-cta-group {
        flex-direction: column;
        align-items: stretch;
        max-width: 320px;
        margin: 26px auto 32px auto;
        gap: 12px;
    }

    .btn-primary-action,
    .btn-secondary-action {
        width: 100%;
        text-align: center;
        justify-content: center;
        padding: 13px 20px;
        font-size: 16px;
    }

    /* Stats Banner */
    .stats-banner {
        flex-direction: column;
        gap: 14px;
        padding: 20px 16px;
        margin: 28px auto 0 auto;
        text-align: center;
    }

    .stat-col {
        padding: 4px 0;
    }

    .stat-num {
        font-size: 28px;
    }

    .stat-lbl {
        font-size: 13px;
    }

    /* Events Section */
    .events-section {
        padding: 46px 0;
    }

    .section-title {
        font-size: 25px;
    }

    .section-desc {
        font-size: 14px;
    }

    .event-card {
        border-radius: 12px;
    }

    .event-card-body {
        padding: 18px 16px;
    }

    .event-card-title {
        font-size: 22px;
    }

    .reg-callout-box {
        padding: 24px 18px;
        margin-top: 36px;
    }

    .callout-inner h3 {
        font-size: 20px;
    }

    .callout-inner p {
        font-size: 14px;
    }

    .btn-reg-now-large {
        width: 100%;
        max-width: 300px;
        padding: 13px 20px;
        font-size: 15px;
        justify-content: center;
    }

    /* Schedule / Timeline */
    .schedule-section {
        padding: 46px 0;
    }

    .timeline-container {
        padding-left: 20px;
        margin-top: 24px;
    }

    .timeline-spine {
        left: 4px;
    }

    .timeline-marker {
        left: -20px;
        width: 14px;
        height: 14px;
    }

    .timeline-card {
        padding: 16px;
        border-radius: 10px;
    }

    .timeline-card-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }

    .timeline-card-title {
        font-size: 19px;
    }

    .timeline-card-sub {
        font-size: 14px;
    }

    .timeline-card-meta {
        flex-direction: column;
        gap: 8px;
    }

    .timeline-meta-point {
        font-size: 13px;
    }

    /* Gallery */
    .gallery-section {
        padding: 44px 0 36px 0;
    }

    .auto-gallery-wrapper {
        padding: 6px 0 16px 0;
    }

    .gallery-photo-card {
        flex: 0 0 240px;
        height: 165px;
        border-radius: 10px;
    }

    .auto-gallery-track {
        gap: 14px;
        animation-duration: 26s;
    }

    .gallery-swipe-hint {
        display: flex;
    }

    .gallery-nav-btn {
        width: 36px;
        height: 36px;
        background: rgba(15, 23, 42, 0.85);
    }

    .gallery-prev-btn {
        left: 8px;
    }

    .gallery-next-btn {
        right: 8px;
    }

    /* Coordinators & Hospitality */
    .coordinators-section {
        padding: 46px 0;
    }

    .coord-group-card {
        padding: 20px 16px;
    }

    .coord-person {
        flex-direction: column;
        align-items: flex-start;
        gap: 6px;
    }

    .hospitality-banner {
        flex-direction: column;
        text-align: left;
        gap: 16px;
        padding: 20px 16px;
        margin-top: 26px;
    }

    .hosp-contact-badge {
        width: 100%;
        text-align: left;
    }

    /* Footer */
    .footer {
        padding: 38px 0 20px 0;
    }

    .footer-top {
        gap: 24px;
        padding-bottom: 24px;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
        gap: 6px;
    }

    /* Modals Responsive */
    .modal-overlay {
        padding: 10px;
        align-items: center;
    }

    .modal-container {
        max-height: 92vh;
        border-radius: 12px;
        width: 100%;
    }

    .modal-header {
        padding: 14px 16px;
    }

    .modal-title {
        font-size: 19px;
    }

    .modal-badge {
        font-size: 11px;
    }

    .modal-body {
        padding: 16px 14px;
    }

    /* CRITICAL: Stack 2-column form grids into 1 column on mobile */
    .form-grid-2 {
        display: flex !important;
        flex-direction: column !important;
        gap: 12px !important;
        margin-bottom: 12px;
    }

    .form-group-title {
        font-size: 14px;
    }

    .form-label {
        font-size: 13px;
    }

    .form-input {
        padding: 10px 12px;
        font-size: 14px;
    }

    .events-select-box {
        padding: 10px;
    }

    .event-checkbox-card {
        padding: 10px;
    }

    .cb-title {
        font-size: 14px;
    }

    .cb-sub {
        font-size: 12px;
    }

    .teammate-toggle-wrap {
        padding: 12px 14px;
    }

    .toggle-info h4 {
        font-size: 14px;
    }

    .toggle-info p {
        font-size: 12px;
    }

    .file-upload-zone {
        padding: 18px 12px;
    }

    .upload-text {
        font-size: 13px;
    }

    .upload-sub {
        font-size: 11px;
    }

    .btn-submit-reg {
        padding: 14px;
        font-size: 16px;
    }

    .event-details-grid {
        display: flex !important;
        flex-direction: column !important;
        gap: 10px !important;
    }

    .success-card {
        padding: 24px 16px;
    }

    .success-title {
        font-size: 22px;
    }

    .reg-id-number {
        font-size: 24px;
        word-break: break-all;
    }

    .btn-join-whatsapp {
        width: 100%;
        padding: 12px 16px;
        font-size: 14px;
    }
}

/* ----------------------------------------------------------
   4. EXTRA SMALL SCREENS & PHONES (max-width: 480px)
   ---------------------------------------------------------- */
@media (max-width: 480px) {
    .container {
        padding: 0 12px;
    }

    .college-header-logo {
        max-height: 44px;
    }

    .hero-title {
        font-size: 38px;
    }

    .hero-tagline {
        font-size: 17px;
    }

    .department-name {
        font-size: 14px;
    }

    .countdown-grid {
        gap: 6px;
        max-width: 320px;
    }

    .countdown-num {
        font-size: 22px;
    }

    .countdown-label {
        font-size: 10px;
    }

    .prize-pill-row {
        grid-template-columns: 1fr;
        gap: 6px;
    }

    .prize-tier {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 7px 12px;
    }

    .tier-label, .tier-amount {
        font-size: 12px;
    }

    .gallery-photo-card {
        flex: 0 0 200px;
        height: 140px;
        border-radius: 8px;
    }

    .auto-gallery-track {
        gap: 12px;
        animation-duration: 22s;
    }

    .gallery-nav-btn {
        width: 32px;
        height: 32px;
    }

    .gallery-nav-btn svg {
        width: 16px;
        height: 16px;
    }

    .gallery-prev-btn {
        left: 6px;
    }

    .gallery-next-btn {
        right: 6px;
    }

    .modal-overlay {
        padding: 6px;
    }

    .modal-header {
        padding: 12px 14px;
    }

    .modal-title {
        font-size: 17px;
    }

    .modal-close-btn {
        width: 28px;
        height: 28px;
        font-size: 16px;
    }

    .modal-body {
        padding: 14px 10px;
    }
}