/* ============================================================ */
/* GLOBAL — Prevent horizontal overflow everywhere              */
/* ============================================================ */

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

*, *::before, *::after {
    max-width: 100%;
}

/* Exceptions for elements that need overflow */
canvas, svg, .chart-wrapper canvas, .heatmap-grid {
    max-width: none;
}

img, video, iframe {
    max-width: 100%;
    height: auto;
}

/* ============================================================ */
/* BASE — Touch-friendly & text readability on all screens      */
/* ============================================================ */

/* Ensure minimum touch targets (44px) */
.nav-item,
.habit-item,
.modal-btn,
.auth-btn,
.settings-btn,
.form-btn,
.onboarding-btn,
.calendar-nav-btn,
.category-filter,
.category-option,
.day-checkbox,
.group-action-btn,
.install-banner-btn,
.validate-day-btn,
.share-day-btn,
.profile-edit-btn,
.profile-change-avatar-btn,
.group-tab,
.chat-send-btn,
.chat-mic-btn {
    min-height: 44px;
}

/* Minimum font size for inputs (prevents iOS zoom) */
input[type="text"],
input[type="email"],
input[type="password"],
input[type="date"],
input[type="time"],
textarea,
select,
.chat-text-input {
    font-size: max(16px, 1rem);
}

/* ============================================================ */
/* MOBILE SMALL (≤360px)                                        */
/* ============================================================ */

@media (max-width: 360px) {
    /* Header */
    .header {
        padding: 12px 10px;
    }
    .header h1 {
        font-size: 1.1rem;
        letter-spacing: 2px;
    }
    .header .quote {
        font-size: 0.65rem;
    }

    /* Date nav */
    .date-nav {
        gap: 8px;
        padding: 10px 8px;
    }
    .date-nav .current-date {
        font-size: 0.85rem;
        min-width: 120px;
    }
    .date-nav button {
        padding: 8px 12px;
        font-size: 1rem;
    }

    /* Habits list */
    .habit-item {
        padding: 12px 8px;
        gap: 10px;
    }
    .habit-fill-bar {
        border-radius: 6px;
    }
    .habit-name {
        font-size: 0.85rem;
    }
    .habit-description {
        font-size: 0.7rem;
    }
    .habit-streak {
        font-size: 0.6rem;
    }
    .habit-progress .percent {
        font-size: 0.85rem;
    }

    /* Section titles */
    .section-title {
        padding: 10px;
        font-size: 0.75rem;
        letter-spacing: 1px;
    }

    /* Category filters */
    .category-filters {
        padding: 0 8px 8px;
        gap: 4px;
    }
    .category-filter {
        padding: 6px 10px;
        font-size: 0.7rem;
    }

    /* XP bar */
    .xp-bar-container {
        margin: 0 8px 10px;
        padding: 10px;
    }
    .xp-level {
        font-size: 0.75rem;
    }
    .xp-amount {
        font-size: 0.65rem;
    }
    /* Validate & share buttons */
    .validate-day-btn,
    .share-day-btn {
        width: calc(100% - 16px);
        margin-left: 8px;
        margin-right: 8px;
        padding: 14px 16px;
        font-size: 0.85rem;
        letter-spacing: 1px;
    }

    /* Bottom nav */
    .bottom-nav .nav-item .icon svg {
        width: 20px;
        height: 20px;
    }
    .bottom-nav .nav-item .label {
        font-size: 0.48rem;
    }
    .nav-item {
        padding: 8px 3px 6px;
    }
    .nav-add-btn {
        width: 50px;
        height: 50px;
        margin-top: -16px;
    }
    .nav-add-icon {
        width: 50px;
        height: 50px;
        font-size: 1.8rem;
    }

    /* Modals */
    .modal-overlay {
        padding: 10px;
    }
    .modal {
        padding: 18px 14px;
        border-radius: 12px;
    }
    .modal h3 {
        font-size: 0.95rem;
        margin-bottom: 14px;
    }
    .modal-large {
        max-height: 80vh;
    }
    .modal-btn {
        padding: 10px;
        font-size: 0.85rem;
    }

    /* Auth */
    .auth-container {
        margin: 20px auto;
        padding: 15px;
    }
    .auth-logo h1 {
        font-size: 1.4rem;
    }
    .auth-logo svg {
        width: 60px;
        height: 60px;
    }

    /* Profile */
    .profile-container {
        padding: 15px 8px;
    }
    .profile-avatar {
        font-size: 3rem;
        width: 70px;
        height: 70px;
    }
    .profile-field {
        padding: 10px 8px;
    }
    .profile-label {
        font-size: 0.65rem;
        min-width: 50px;
    }
    .profile-value {
        font-size: 0.85rem;
    }

    /* Groups */
    .groups-container {
        padding: 10px 8px;
    }
    .groups-header {
        gap: 6px;
    }
    .group-action-btn {
        font-size: 0.78rem;
        padding: 10px 8px;
    }
    .group-card {
        padding: 12px;
    }
    .group-card-name {
        font-size: 0.9rem;
    }

    /* Settings */
    .settings-container {
        padding: 10px 8px;
    }
    .settings-item {
        padding: 8px 10px;
        flex-wrap: wrap;
        gap: 8px;
    }
    .settings-item-label {
        font-size: 0.75rem;
    }
    .settings-item-desc {
        font-size: 0.6rem;
    }
    .settings-btn {
        padding: 6px 12px;
        font-size: 0.65rem;
    }

    /* Motivation card */
    .motivation-card {
        margin: 10px 8px;
        padding: 15px;
    }
    .motivation-card .quote-text {
        font-size: 0.8rem;
    }

    /* Onboarding */
    .onboarding-card {
        padding: 25px 15px;
    }
    .onboarding-icon {
        font-size: 2.5rem;
    }
    .onboarding-title {
        font-size: 1rem;
    }
    .onboarding-text {
        font-size: 0.8rem;
    }

    /* Level up overlay */
    .levelup-title {
        font-size: 2rem;
        letter-spacing: 3px;
    }
    .levelup-number {
        font-size: 4rem;
    }
    .levelup-xp-bar {
        width: 180px;
    }

    /* Avatar picker */
    .avatar-picker-grid {
        grid-template-columns: repeat(5, 1fr);
        gap: 6px;
    }
    .avatar-option {
        font-size: 1.4rem;
    }

    /* Form groups inside modals */
    .form-group label {
        font-size: 0.7rem;
    }
    .form-group input[type="text"],
    .form-group textarea {
        padding: 8px 10px;
        font-size: 0.85rem;
    }

    /* Schedule picker */
    .schedule-type-btn {
        padding: 10px 8px;
        font-size: 0.78rem;
    }

    /* Celebration */
    .celebration-icon {
        font-size: 3.5rem;
    }
    .celebration-title {
        font-size: 1.5rem;
    }
    .celebration-subtitle {
        font-size: 0.9rem;
    }

    /* Group tabs */
    .group-tab {
        font-size: 0.75rem;
        padding: 8px 10px;
    }

    /* Install banner */
    .install-banner {
        padding: 12px;
    }
    .install-banner-title {
        font-size: 0.85rem;
    }
    .install-banner-desc {
        font-size: 0.7rem;
    }
}

/* ============================================================ */
/* SMALL MOBILE (≤375px) — iPhone SE, old phones                */
/* ============================================================ */

@media (max-width: 375px) {
    .score-banner {
        padding: 12px 14px;
        gap: 10px;
        margin: 10px;
    }
    .score-banner-value {
        font-size: 1.5rem;
        min-width: 55px;
    }
    .score-banner-icon {
        width: 36px;
        height: 36px;
    }
    .xp-bar-container {
        margin: 0 10px 10px;
        padding: 12px 12px;
    }
    .xp-level {
        font-size: 0.75rem;
    }
    .stat-card .stat-value {
        font-size: 1.3rem;
    }
    .stat-card .stat-label {
        font-size: 0.6rem;
    }
    .section-title {
        font-size: 0.75rem;
        margin: 12px 10px 8px;
    }
    .ranked-coming-soon {
        margin: 10px;
        padding: 12px 14px;
    }
    .stats-grid {
        gap: 8px;
        padding: 0 10px;
    }
    .week-dots-container {
        margin: 0 10px;
    }
}

/* ============================================================ */
/* MOBILE STANDARD (≤480px)                                     */
/* ============================================================ */

@media (max-width: 480px) {
    /* Ensure no horizontal overflow */
    .page {
        overflow-x: hidden;
    }

    /* Score banner */
    .score-banner {
        margin: 12px;
    }
    .score-banner-value {
        font-size: 1.8rem;
        min-width: 60px;
    }

    /* Manage habits modal - ensure form doesn't overflow */
    .add-habit-section {
        max-width: 100%;
    }

    .icon-picker,
    .color-picker-grid,
    .category-picker,
    .schedule-type-picker,
    .days-of-week-picker {
        max-width: 100%;
        overflow: hidden;
    }

    /* Habit management list items */
    .habit-management-item {
        overflow: hidden;
    }
    .habit-management-header {
        flex-wrap: wrap;
    }
    .habit-management-description {
        padding-left: 0;
    }

    /* Calendar modal */
    .modal-calendar {
        max-width: 100%;
        width: 100%;
        padding: 15px 10px;
    }
    .calendar-header h3 {
        font-size: 0.95rem;
    }

    /* QR Modal */
    #qrCanvas {
        max-width: 200px !important;
    }

    /* Badges grid */
    .badges-grid {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
        gap: 8px;
        padding: 8px;
    }

    /* Leaderboard */
    .leaderboard-card {
        padding: 10px 8px;
        gap: 8px;
    }
    .leaderboard-position {
        font-size: 1rem;
        min-width: 24px;
    }
    .leaderboard-avatar {
        font-size: 1.3rem;
        width: 32px;
        height: 32px;
    }
    .leaderboard-pseudo {
        font-size: 0.8rem;
    }
    .leaderboard-score {
        font-size: 0.95rem;
        min-width: 36px;
    }
    .leaderboard-summary-grid,
    .leaderboard-podium {
        grid-template-columns: 1fr;
    }
    .leaderboard-overview {
        padding: 16px;
        border-radius: 20px;
    }
    .leaderboard-position {
        min-width: 30px;
        height: 30px;
    }
    .leaderboard-avatar {
        width: 36px;
        height: 36px;
    }
    .leaderboard-pseudo-row,
    .leaderboard-progress-row {
        align-items: flex-start;
        flex-direction: column;
    }
    .leaderboard-rank-badge {
        align-self: flex-start;
    }
    .leaderboard-podium-card {
        padding: 16px 14px;
    }
    .leaderboard-podium-avatar {
        width: 50px;
        height: 50px;
    }

    /* Chat improvements */
    .chat-bubble {
        max-width: 85%;
    }
    .chat-reply-btn {
        opacity: 0.5;
        right: -24px;
    }
    .chat-bubble-me .chat-reply-btn {
        left: -24px;
    }
    .chat-reply-quote-text {
        max-width: 150px;
    }

    /* Recording bar */
    .chat-recording-bar {
        padding: 6px 10px;
    }

    /* Group detail */
    .group-code-value {
        font-size: 1.2rem;
        letter-spacing: 3px;
    }

    /* Analytics - ensure full width */
    .analytics-container {
        overflow: hidden;
    }

    /* Heatmap scroll */
    .heatmap-container {
        padding: 10px 8px;
    }

    /* Reward themes */
    .reward-themes-grid {
        gap: 10px;
        padding: 10px;
    }
}

/* ============================================================ */
/* TABLET (481px - 767px) — breathing room                      */
/* ============================================================ */

@media (min-width: 481px) and (max-width: 767px) {
    /* Container centering */
    #page-today,
    #page-stats,
    #page-motivation,
    #page-profile,
    #page-groups {
        max-width: 600px;
        margin: 0 auto;
    }

    /* KPI grid can breathe */
    .kpi-container {
        gap: 12px;
        padding: 15px 20px;
    }
    .kpi-card .value {
        font-size: 1.6rem;
    }

    /* Stats grid */
    .stats-grid {
        gap: 12px;
        padding: 15px 20px;
    }
    .stat-card .stat-value {
        font-size: 2rem;
    }

    /* Weekly grid */
    .weekly-grid {
        gap: 6px;
        padding: 15px 20px;
    }

    /* Badges */
    .badges-grid {
        grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
    }

    /* Chat more space */
    .chat-messages {
        height: 320px;
    }

    /* Reward themes 3-col */
    .reward-themes-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* ============================================================ */
/* TABLET-LANDSCAPE / SMALL DESKTOP (768px - 1024px)            */
/* ============================================================ */

@media (min-width: 768px) and (max-width: 1024px) {
    /* App container */
    #page-today,
    #page-stats,
    #page-motivation,
    #page-profile,
    #page-groups,
    #page-auth {
        max-width: 700px;
        margin: 0 auto;
    }

    /* KPI — more breathing room */
    .kpi-container {
        gap: 15px;
        padding: 20px 25px;
    }
    .kpi-card {
        padding: 16px 12px;
    }
    .kpi-card .value {
        font-size: 1.8rem;
    }

    /* Stats grid — could be 4 cols */
    .stats-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 12px;
        padding: 20px 25px;
    }

    /* Weekly grid */
    .weekly-grid {
        gap: 8px;
        padding: 20px 25px;
    }
    .weekly-day {
        padding: 12px 8px;
    }
    .weekly-day .day-name {
        font-size: 0.7rem;
    }
    .weekly-day .day-score {
        font-size: 1.1rem;
    }

    /* Charts */
    .chart-container {
        padding: 20px 25px;
    }

    /* Badges — 4-col */
    .badges-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: 14px;
        padding: 20px;
    }

    /* Reward themes — 3-col */
    .reward-themes-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 14px;
        padding: 20px;
    }

    /* Chat bigger */
    .chat-messages {
        height: 380px;
    }

    /* Modals */
    .modal {
        max-width: 480px;
    }
    .modal-large {
        max-width: 560px;
    }

    /* Groups layout */
    .groups-container {
        padding: 20px 25px;
    }

    /* Settings */
    .settings-container {
        padding: 20px 25px;
    }
}

/* ============================================================ */
/* DESKTOP (≥768px) — Full experience                           */
/* ============================================================ */

@media (min-width: 768px) {
    /* ---- App Container ---- */
    #page-today,
    #page-stats,
    #page-motivation,
    #page-profile,
    #page-groups,
    #page-admin {
        max-width: 700px;
        margin: 0 auto;
        padding: 0 24px;
    }

    #page-auth {
        max-width: 500px;
        margin: 0 auto;
    }

    /* ---- Header ---- */
    .header {
        padding: 20px 30px;
    }

    /* ---- Modals — centered, max-width ---- */
    .modal {
        max-width: 500px;
        border-radius: 16px;
    }
    .modal-large {
        max-width: 580px;
    }
    .modal-calendar {
        max-width: 560px;
    }

    /* ---- Bottom nav stays but gets cleaner ---- */
    .bottom-nav {
        max-width: 700px;
        margin: 0 auto;
        left: 50%;
        transform: translateX(-50%);
        border-radius: 20px 20px 0 0;
        border: 1px solid var(--steel);
        border-bottom: none;
    }
    .nav-item {
        padding: 12px 10px;
    }
    .nav-item .label {
        font-size: 0.65rem;
    }
    .nav-item .icon svg {
        width: 24px;
        height: 24px;
    }
    .nav-add-btn:hover .nav-add-icon {
        transform: scale(1.1) rotate(90deg);
        box-shadow: 0 6px 20px rgba(46, 204, 113, 0.5);
    }

    /* ---- Hover states for desktop (cursor pointer, effects) ---- */
    .habit-item:hover {
        background: var(--charcoal);
        border-left-color: var(--accent-dim);
        cursor: pointer;
    }
    .habit-item.completed:hover {
        background: linear-gradient(90deg, rgba(46, 204, 113, 0.2), rgba(46, 204, 113, 0.08), transparent);
    }

    .habit-item:hover .habit-fill-bar {
        opacity: 0.9;
    }

    .stat-card:hover {
        transform: translateY(-3px);
        box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
    }

    .kpi-card:hover {
        transform: translateY(-3px);
        box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
    }

    .group-card:hover {
        transform: translateY(-3px);
        box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
    }

    .badge-card.unlocked:hover {
        transform: translateY(-5px) scale(1.03);
    }

    .settings-category:hover {
        border-color: var(--accent-dim);
    }

    .category-filter:hover {
        background: var(--steel);
        cursor: pointer;
    }

    .date-nav button:hover {
        background: var(--steel);
        border-color: var(--accent-dim);
        cursor: pointer;
    }

    .nav-item:hover {
        background: var(--charcoal);
        cursor: pointer;
    }

    .validate-day-btn:hover {
        transform: translateY(-3px);
        box-shadow: 0 8px 30px rgba(25, 230, 57, 0.4);
        cursor: pointer;
    }

    .share-day-btn:hover {
        cursor: pointer;
    }

    .auth-btn:hover {
        opacity: 0.9;
        cursor: pointer;
    }

    .auth-tab:hover {
        background: var(--steel);
        cursor: pointer;
    }

    .modal-btn:hover {
        opacity: 0.9;
        cursor: pointer;
    }

    .group-tab:hover {
        cursor: pointer;
    }

    .onb-template-card:hover {
        cursor: pointer;
    }

    .reward-theme-card:hover {
        cursor: pointer;
    }

    .profile-edit-btn:hover {
        cursor: pointer;
        opacity: 1;
    }

    .profile-change-avatar-btn:hover {
        cursor: pointer;
    }

    .avatar-option:hover {
        cursor: pointer;
    }

    /* ---- Chat — more space on desktop ---- */
    .chat-messages {
        height: 400px;
    }

    .chat-bubble {
        max-width: 70%;
    }

    .chat-text-input {
        padding: 12px 20px;
        font-size: 0.9rem;
    }

    /* Chat reply button visible on hover */
    .chat-reply-btn {
        opacity: 0;
    }
    .chat-bubble:hover .chat-reply-btn {
        opacity: 1;
    }

    /* ---- Weekly grid — bigger cells ---- */
    .weekly-grid {
        gap: 8px;
    }
    .weekly-day {
        padding: 14px 8px;
    }

    /* ---- Charts — better size ---- */
    canvas {
        max-height: 250px;
    }

    /* ---- Onboarding — centered & limited width ---- */
    .onboarding-card {
        max-width: 450px;
    }
    .onb-container {
        max-width: 520px;
    }

    /* ---- Level up — scale nicely ---- */
    .levelup-title {
        font-size: 3.5rem;
    }
    .levelup-number {
        font-size: 7rem;
    }
    .levelup-xp-bar {
        width: 280px;
    }

    /* ---- Install banner — centered ---- */
    .install-banner {
        max-width: 700px;
        left: 50%;
        transform: translateX(-50%) translateY(100%);
        border-radius: 16px 16px 0 0;
    }
    .install-banner.visible {
        transform: translateX(-50%) translateY(0);
    }

    /* ---- Avatar picker — 8 col on desktop ---- */
    .avatar-picker-grid {
        grid-template-columns: repeat(8, 1fr);
    }

    /* ---- Reward themes — 3 cols ---- */
    .reward-themes-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    /* ---- Onboarding templates — can go 3 cols ---- */
    .onb-templates-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    /* ---- Streak widget max width ---- */
    .streak-widget {
        max-width: 400px;
        margin: 15px auto;
    }

    /* ---- Motivation card more padding ---- */
    .motivation-card {
        margin: 20px 0;
        padding: 25px 30px;
    }

    /* ---- Auth — nicer spacing ---- */
    .auth-container {
        margin: 80px auto;
        padding: 40px;
        background: var(--dark-gray);
        border: 1px solid var(--steel);
        border-radius: 16px;
    }

    /* ---- Calendar — bigger cells ---- */
    .calendar-day {
        font-size: 0.8rem;
    }
    .calendar-days-grid {
        gap: 5px;
    }

    /* ---- Toast — wider on desktop ---- */
    .toast-container {
        max-width: 500px;
    }

    /* ---- Splash screen — bigger logo ---- */
    .splash-logo {
        width: 100px;
        height: 100px;
    }
    .splash-title {
        font-size: 1.8rem;
    }
}

/* ============================================================ */
/* LARGE DESKTOP (≥1024px) — Even more space                    */
/* ============================================================ */

@media (min-width: 1024px) {
    /* Bigger app container */
    #page-today,
    #page-stats,
    #page-motivation,
    #page-profile,
    #page-groups,
    #page-admin {
        max-width: 760px;
    }

    /* Stats grid stays 4 cols */
    .stats-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 15px;
    }

    /* Badges — 5-col possible */
    .badges-grid {
        grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
        gap: 15px;
    }

    /* Reward themes — 4 cols */
    .reward-themes-grid {
        grid-template-columns: repeat(4, 1fr);
    }

    /* Bottom nav max width */
    .bottom-nav {
        max-width: 760px;
    }
}

/* ============================================================ */
/* LANDING PAGE — Desktop responsive                            */
/* ============================================================ */

@media (min-width: 768px) {
    /* Landing — features side by side, already handled in landing.html */
    /* But ensure sections have more padding */
}

@media (min-width: 1024px) {
    /* Landing page wider sections */
}

/* ============================================================ */
/* LIGHT THEME — Desktop hover fixes                            */
/* ============================================================ */

@media (min-width: 768px) {
    [data-theme="light"] .habit-item:hover {
        background: var(--charcoal);
    }
    [data-theme="light"] .habit-item.completed:hover {
        background: linear-gradient(90deg, rgba(46, 204, 113, 0.2), rgba(46, 204, 113, 0.08), transparent);
    }
    [data-theme="light"] .stat-card:hover,
    [data-theme="light"] .kpi-card:hover {
        box-shadow: 0 6px 20px rgba(0, 0, 0, 0.12);
    }
    [data-theme="light"] .auth-container {
        box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
    }
    [data-theme="light"] .bottom-nav {
        box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.06);
    }
}

/* ============================================================ */
/* PRINT — Hide non-essential elements                          */
/* ============================================================ */

@media print {
    .bottom-nav,
    .header,
    .install-banner,
    .splash-screen,
    .toast-container,
    .modal-overlay,
    .celebration-overlay,
    .levelup-overlay {
        display: none !important;
    }
    body {
        padding-bottom: 0;
    }
}

/* ============================================================
   CHAT MOBILE — RESPONSIVE FIXES
   ============================================================ */
@media (max-width: 480px) {
    .chat-messages {
        height: 50vh;
        min-height: 250px;
    }
    .chat-bubble {
        max-width: 85%;
    }
    .chat-msg-more-btn {
        opacity: 0.6;
        width: 24px;
        height: 24px;
        font-size: 0.85rem;
    }
    .chat-msg-menu button {
        padding: 6px 10px;
        font-size: 0.7rem;
    }
    .chat-input-row {
        gap: 6px;
    }
    .chat-audio-preview {
        gap: 6px;
    }
    .group-tab-buttons {
        flex-wrap: nowrap;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        gap: 4px;
    }
    .group-tab-btn {
        flex-shrink: 0;
        font-size: 0.7rem;
        padding: 8px 10px;
    }
}