/* ═══════════════════════════════════════════
   Kululu Design System v4.0
   Warm · Clean · Elegant
   ═══════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Assistant:wght@300;400;500;600;700&family=Playfair+Display:ital,wght@0,400;0,500;0,600;0,700;1,400&display=swap');

:root {
    /* ─ Primary — warm dark caramel ─ */
    --k-primary: #7A6040;
    --k-primary-dark: #5E4A30;
    --k-primary-light: #B8956A;
    --k-primary-bg: #FBF5EE;
    --k-primary-10: rgba(122,96,64,0.12);
    --k-primary-20: rgba(122,96,64,0.22);

    /* ─ Accent — soft terracotta ─ */
    --k-accent: #C4836A;
    --k-accent-light: #F0DDD6;
    --k-accent-bg: rgba(196,131,106,0.08);

    /* ─ Neutral — warm grays ─ */
    --k-bg: #FAF8F5;
    --k-surface: #FFFFFF;
    --k-surface-hover: #FEFDFB;
    --k-border: #EDE6DD;
    --k-border-light: #F5F0EA;
    --k-text: #2D2926;
    --k-text-secondary: #7A6E62;
    --k-text-muted: #B5A99E;

    /* ─ Semantic ─ */
    --k-success: #5D8C5D;
    --k-success-bg: #EFF6EF;
    --k-success-border: rgba(93,140,93,0.2);
    --k-warning: #C99A3A;
    --k-warning-bg: #FDF5E6;
    --k-warning-border: rgba(201,154,58,0.2);
    --k-danger: #C25050;
    --k-danger-bg: #FDF0F0;
    --k-danger-border: rgba(194,80,80,0.2);

    /* ─ Radius ─ */
    --k-radius-sm: 8px;
    --k-radius: 12px;
    --k-radius-lg: 16px;
    --k-radius-xl: 24px;

    /* ─ Shadows ─ */
    --k-shadow-xs: 0 1px 2px rgba(45,41,38,0.03);
    --k-shadow-sm: 0 1px 4px rgba(45,41,38,0.05);
    --k-shadow: 0 4px 16px rgba(45,41,38,0.06);
    --k-shadow-lg: 0 8px 32px rgba(45,41,38,0.08);
    --k-shadow-xl: 0 16px 48px rgba(45,41,38,0.10);

    /* ─ Transitions ─ */
    --k-ease: cubic-bezier(0.4, 0, 0.2, 1);
    --k-ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
    --k-duration: 0.25s;
}

/* ═══════ BASE ═══════════════════════════ */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

* {
    font-family: 'Assistant', -apple-system, BlinkMacSystemFont, sans-serif;
}

html {
    scroll-behavior: smooth;
    -webkit-tap-highlight-color: transparent;
}

body {
    background: var(--k-bg);
    color: var(--k-text);
    min-height: 100vh;
    direction: rtl;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    line-height: 1.6;
    font-size: 15px;
}

h1, h2, h3 {
    font-family: 'Playfair Display', Georgia, serif;
    font-weight: 600;
    color: var(--k-text);
    line-height: 1.3;
}

h1 { font-size: 28px; }
h2 { font-size: 20px; }
h3 { font-size: 17px; }

a {
    color: inherit;
    text-decoration: none;
}

img { max-width: 100%; }

::selection {
    background: var(--k-primary-20);
    color: var(--k-text);
}

/* ═══════ LAYOUT ═════════════════════════ */
.k-page {
    max-width: 640px;
    margin: 0 auto;
    padding: 0 20px;
}

.k-section {
    margin-bottom: 28px;
}

.k-gap-sm { gap: 8px; }
.k-gap { gap: 12px; }
.k-gap-lg { gap: 20px; }

/* ═══════ CARDS ══════════════════════════ */
.k-card {
    background: var(--k-surface);
    border: 1px solid var(--k-border);
    border-radius: var(--k-radius-lg);
    box-shadow: var(--k-shadow-xs);
    transition: box-shadow var(--k-duration) var(--k-ease),
                transform var(--k-duration) var(--k-ease),
                border-color var(--k-duration) var(--k-ease);
}

.k-card:hover {
    box-shadow: var(--k-shadow-sm);
}

.k-card-interactive {
    cursor: pointer;
}

.k-card-interactive:hover {
    box-shadow: var(--k-shadow);
    transform: translateY(-2px);
    border-color: var(--k-primary-20);
}

.k-card-interactive:active {
    transform: translateY(0);
    box-shadow: var(--k-shadow-sm);
}

.k-card-highlight {
    border-color: var(--k-primary-20);
    background: linear-gradient(135deg, var(--k-surface), var(--k-primary-bg));
}

/* ═══════ BUTTONS ════════════════════════ */
.k-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border: none;
    border-radius: var(--k-radius);
    font-family: 'Assistant', sans-serif;
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    transition: all var(--k-duration) var(--k-ease);
    padding: 10px 22px;
    line-height: 1.4;
    white-space: nowrap;
    position: relative;
    overflow: hidden;
}

.k-btn:active {
    transform: scale(0.97);
}

.k-btn-primary {
    background: var(--k-primary);
    color: white;
    box-shadow: 0 2px 8px rgba(94,74,48,0.25);
}
.k-btn-primary:hover {
    background: var(--k-primary-dark);
    box-shadow: 0 4px 20px rgba(94,74,48,0.35);
    transform: translateY(-1px);
}

.k-btn-secondary {
    background: rgba(122,96,64,0.14);
    color: var(--k-primary);
    border: 1.5px solid rgba(122,96,64,0.28);
    font-weight: 700;
}
.k-btn-secondary:hover {
    background: rgba(122,96,64,0.22);
    border-color: rgba(122,96,64,0.38);
}

.k-btn-outline {
    background: transparent;
    color: var(--k-primary);
    border: 1.5px solid rgba(122,96,64,0.35);
}
.k-btn-outline:hover {
    border-color: var(--k-primary);
    color: var(--k-primary-dark);
    background: var(--k-primary-bg);
}

.k-btn-ghost {
    background: transparent;
    color: var(--k-primary);
    padding: 8px 14px;
}
.k-btn-ghost:hover {
    background: var(--k-primary-bg);
    color: var(--k-primary-dark);
}

.k-btn-sm {
    padding: 7px 16px;
    font-size: 13px;
    border-radius: var(--k-radius-sm);
}

.k-btn-lg {
    padding: 14px 32px;
    font-size: 16px;
    border-radius: var(--k-radius);
}

.k-btn-icon {
    width: 40px;
    height: 40px;
    padding: 0;
    border-radius: var(--k-radius);
}

.k-btn-icon-sm {
    width: 32px;
    height: 32px;
    padding: 0;
    border-radius: var(--k-radius-sm);
    font-size: 13px;
}

.k-btn-danger {
    background: var(--k-danger-bg);
    color: var(--k-danger);
    border: 1px solid var(--k-danger-border);
}
.k-btn-danger:hover {
    background: rgba(194,80,80,0.15);
}

.k-btn-success {
    background: var(--k-success);
    color: white;
    box-shadow: 0 2px 8px rgba(93,140,93,0.2);
}
.k-btn-success:hover {
    background: #4E7E4E;
}

/* Floating Action Button */
.k-fab {
    position: fixed;
    bottom: 88px;
    left: 20px;
    width: 52px;
    height: 52px;
    border-radius: 50%;
    background: var(--k-primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    box-shadow: 0 4px 20px rgba(94,74,48,0.4);
    cursor: pointer;
    transition: all var(--k-duration) var(--k-ease-spring);
    z-index: 35;
    border: none;
}
.k-fab:hover {
    transform: scale(1.08);
    box-shadow: 0 6px 28px rgba(94,74,48,0.5);
}
.k-fab:active {
    transform: scale(0.95);
}

/* ═══════ BADGES ═════════════════════════ */
.k-badge {
    display: inline-flex;
    align-items: center;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    line-height: 1.6;
    letter-spacing: -0.01em;
}

.k-badge-confirmed, .k-badge-paid { background: var(--k-success-bg); color: var(--k-success); }
.k-badge-pending, .k-badge-partial { background: var(--k-warning-bg); color: var(--k-warning); }
.k-badge-declined { background: var(--k-danger-bg); color: var(--k-danger); }
.k-badge-unpaid { background: var(--k-border-light); color: var(--k-text-muted); }
.k-badge-neutral { background: var(--k-border-light); color: var(--k-text-secondary); }
.k-badge-accent { background: var(--k-accent-bg); color: var(--k-accent); }
.k-badge-primary { background: var(--k-primary-10); color: var(--k-primary-dark); }

/* ═══════ FORM INPUTS ════════════════════ */
.k-input {
    width: 100%;
    border: 1.5px solid var(--k-border);
    border-radius: var(--k-radius);
    padding: 12px 16px;
    font-size: 15px;
    font-family: 'Assistant', sans-serif;
    text-align: right;
    outline: none;
    background: var(--k-surface);
    color: var(--k-text);
    transition: border-color var(--k-duration) var(--k-ease),
                box-shadow var(--k-duration) var(--k-ease);
}

.k-input:hover {
    border-color: var(--k-primary-20);
}

.k-input:focus {
    border-color: var(--k-primary);
    box-shadow: 0 0 0 3px var(--k-primary-10);
}

.k-input::placeholder {
    color: var(--k-text-muted);
}

.k-input-lg {
    padding: 14px 18px;
    font-size: 16px;
    border-radius: var(--k-radius-lg);
}

.k-textarea {
    resize: vertical;
    min-height: 80px;
}

.k-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%237A6E62' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: left 14px center;
    padding-left: 36px;
    cursor: pointer;
}

.k-label {
    font-size: 13px;
    font-weight: 600;
    color: var(--k-text-secondary);
    margin-bottom: 6px;
    display: block;
}

.k-field {
    margin-bottom: 16px;
}

/* ═══════ NAVIGATION ═════════════════════ */

/* Header */
.k-header {
    background: rgba(255,255,255,0.95);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--k-border);
    padding: 16px 20px;
    position: sticky;
    top: 0;
    z-index: 30;
}

/* Bottom nav */
.k-bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(255,255,255,0.97);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    border-top: 1px solid var(--k-border);
    z-index: 40;
    padding: 6px 0 max(6px, env(safe-area-inset-bottom));
}

.k-bottom-nav .nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-around;
    max-width: 500px;
    margin: 0 auto;
    padding: 0 4px;
}

.k-nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 6px 14px;
    border-radius: var(--k-radius);
    color: var(--k-text-muted);
    font-size: 10px;
    font-weight: 500;
    transition: all var(--k-duration) var(--k-ease);
    gap: 3px;
    text-decoration: none;
    -webkit-tap-highlight-color: transparent;
}

.k-nav-item svg,
.k-nav-item .nav-icon {
    width: 22px;
    height: 22px;
    stroke-width: 1.8;
    transition: transform var(--k-duration) var(--k-ease);
}

.k-nav-item.active {
    color: var(--k-primary);
    background: var(--k-primary-bg);
    font-weight: 700;
}

.k-nav-item.active svg,
.k-nav-item.active .nav-icon {
    transform: scale(1.1);
}

.k-nav-item:not(.active):hover {
    color: var(--k-text-secondary);
}

/* ═══════ MODAL / SHEET ══════════════════ */
.k-overlay {
    position: fixed;
    inset: 0;
    background: rgba(45,41,38,0.35);
    z-index: 100;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    -webkit-backdrop-filter: blur(3px);
    backdrop-filter: blur(3px);
    animation: k-fadeIn var(--k-duration) var(--k-ease);
}

@keyframes k-fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.k-sheet {
    background: var(--k-surface);
    width: 100%;
    max-width: 560px;
    border-radius: var(--k-radius-xl) var(--k-radius-xl) 0 0;
    padding: 20px 24px 32px;
    max-height: 92vh;
    overflow-y: auto;
    animation: k-slideUp 0.35s var(--k-ease-spring);
    box-shadow: var(--k-shadow-xl);
}

@keyframes k-slideUp {
    from { transform: translateY(100%); opacity: 0.8; }
    to { transform: translateY(0); opacity: 1; }
}

.k-sheet-handle {
    width: 36px;
    height: 4px;
    background: var(--k-border);
    border-radius: 4px;
    margin: 0 auto 20px;
}

.k-sheet-title {
    font-family: 'Playfair Display', serif;
    font-size: 20px;
    font-weight: 600;
    text-align: center;
    margin-bottom: 20px;
    color: var(--k-text);
}

/* ═══════ TOAST ══════════════════════════ */
.k-toast {
    position: fixed;
    bottom: 100px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--k-text);
    color: white;
    padding: 12px 24px;
    border-radius: var(--k-radius-lg);
    z-index: 200;
    font-size: 14px;
    font-weight: 500;
    box-shadow: var(--k-shadow-xl);
    animation: k-toast 0.4s var(--k-ease-spring);
    max-width: 90vw;
}

@keyframes k-toast {
    from { opacity: 0; transform: translate(-50%, 16px); }
    to { opacity: 1; transform: translate(-50%, 0); }
}

/* ═══════ PROGRESS ═══════════════════════ */
.k-progress-track {
    height: 6px;
    background: var(--k-border-light);
    border-radius: 6px;
    overflow: hidden;
}

.k-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--k-primary), var(--k-primary-light));
    border-radius: 6px;
    transition: width 0.6s var(--k-ease);
}

.k-progress-success .k-progress-fill {
    background: linear-gradient(90deg, var(--k-success), #7BB87B);
}

/* ═══════ NAV GRID ═══════════════════════ */
.k-nav-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
}

.k-nav-tile {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 18px 8px 14px;
    border-radius: var(--k-radius-lg);
    background: var(--k-surface);
    border: 1px solid var(--k-border);
    text-decoration: none;
    transition: all var(--k-duration) var(--k-ease);
    gap: 8px;
}

.k-nav-tile:hover {
    border-color: var(--k-primary-20);
    box-shadow: var(--k-shadow);
    transform: translateY(-2px);
}

.k-nav-tile:active {
    transform: translateY(0);
}

.k-nav-tile-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--k-radius);
    background: var(--k-primary-bg);
    color: var(--k-primary);
    font-size: 18px;
    transition: transform var(--k-duration) var(--k-ease);
}

.k-nav-tile:hover .k-nav-tile-icon {
    transform: scale(1.08);
}

.k-nav-tile-label {
    font-size: 13px;
    font-weight: 600;
    color: var(--k-text-secondary);
}

/* ═══════ STAT CARD ══════════════════════ */
.k-stat {
    text-align: center;
    padding: 16px 10px;
}

.k-stat-value {
    font-size: 24px;
    font-weight: 700;
    color: var(--k-text);
    line-height: 1.2;
    font-variant-numeric: tabular-nums;
}

.k-stat-label {
    font-size: 12px;
    color: var(--k-text-muted);
    margin-top: 4px;
    font-weight: 500;
}

.k-stat-sub {
    font-size: 11px;
    font-weight: 600;
    margin-top: 6px;
}

/* ═══════ EMPTY STATE ════════════════════ */
.k-empty {
    text-align: center;
    padding: 48px 24px;
    color: var(--k-text-muted);
}

.k-empty-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 16px;
    border-radius: 50%;
    background: var(--k-border-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    opacity: 0.6;
}

.k-empty-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--k-text-secondary);
    margin-bottom: 6px;
}

.k-empty-text {
    font-size: 14px;
    color: var(--k-text-muted);
    max-width: 260px;
    margin: 0 auto;
}

/* ═══════ TABS ═══════════════════════════ */
.k-tabs {
    display: flex;
    gap: 0;
    border-bottom: 1px solid var(--k-border);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.k-tab {
    padding: 10px 18px;
    border: none;
    background: transparent;
    color: var(--k-text-muted);
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    border-bottom: 2.5px solid transparent;
    transition: all var(--k-duration) var(--k-ease);
    white-space: nowrap;
    font-family: 'Assistant', sans-serif;
}

.k-tab:hover {
    color: var(--k-text-secondary);
}

.k-tab.active {
    color: var(--k-primary);
    border-bottom-color: var(--k-primary);
}

/* ═══════ PILLS (filter chips) ═══════════ */
.k-pills {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding: 2px 0;
    scrollbar-width: none;
}
.k-pills::-webkit-scrollbar { display: none; }

.k-pill {
    padding: 7px 16px;
    border: 1.5px solid var(--k-border);
    border-radius: 24px;
    background: var(--k-surface);
    color: var(--k-text-secondary);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--k-duration) var(--k-ease);
    white-space: nowrap;
    font-family: 'Assistant', sans-serif;
}

.k-pill:hover {
    border-color: var(--k-primary-20);
    color: var(--k-primary-dark);
}

.k-pill.active {
    background: var(--k-primary);
    border-color: var(--k-primary);
    color: white;
}

/* ═══════ WHATSAPP ═══════════════════════ */
.k-wa-btn {
    background: #25D366;
    color: white;
    border: none;
    border-radius: var(--k-radius);
    padding: 8px 18px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: all var(--k-duration) var(--k-ease);
    font-family: 'Assistant', sans-serif;
}
.k-wa-btn:hover {
    background: #1DAF54;
    box-shadow: 0 4px 12px rgba(37,211,102,0.25);
}

/* ═══════ DIVIDER ════════════════════════ */
.k-divider {
    height: 1px;
    background: var(--k-border);
    margin: 20px 0;
}

/* ═══════ UTILITIES ══════════════════════ */
.k-section-title {
    font-family: 'Playfair Display', serif;
    font-size: 20px;
    font-weight: 600;
    color: var(--k-text);
    margin-bottom: 16px;
}

.k-text-primary { color: var(--k-primary); }
.k-text-secondary { color: var(--k-text-secondary); }
.k-text-muted { color: var(--k-text-muted); }
.k-text-success { color: var(--k-success); }
.k-text-warning { color: var(--k-warning); }
.k-text-danger { color: var(--k-danger); }

.k-bg-primary { background: var(--k-primary-bg); }
.k-bg-surface { background: var(--k-surface); }
.k-bg-muted { background: var(--k-border-light); }

.k-truncate {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* ═══════ ANIMATIONS ═════════════════════ */
@keyframes k-fadeInUp {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes k-scaleIn {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

@keyframes k-pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.k-animate-in {
    animation: k-fadeInUp 0.4s var(--k-ease) both;
}

.k-animate-delay-1 { animation-delay: 0.05s; }
.k-animate-delay-2 { animation-delay: 0.1s; }
.k-animate-delay-3 { animation-delay: 0.15s; }
.k-animate-delay-4 { animation-delay: 0.2s; }

.k-skeleton {
    background: linear-gradient(90deg, var(--k-border-light) 25%, var(--k-bg) 50%, var(--k-border-light) 75%);
    background-size: 200% 100%;
    animation: k-shimmer 1.5s infinite;
    border-radius: var(--k-radius-sm);
}

@keyframes k-shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ═══════ RESPONSIVE ═════════════════════ */
@media (max-width: 480px) {
    .k-nav-grid { grid-template-columns: repeat(3, 1fr); gap: 8px; }
    .k-stat-value { font-size: 20px; }
    h1 { font-size: 24px; }
    h2 { font-size: 18px; }
    .k-sheet { padding: 16px 20px 28px; }
}

@media (min-width: 640px) {
    .k-nav-grid { grid-template-columns: repeat(4, 1fr); }
}

/* ═══════ PRINT ══════════════════════════ */
@media print {
    .k-bottom-nav, .k-header, .k-toast, .k-fab { display: none !important; }
    body { background: white; padding: 0; }
    .k-card { box-shadow: none; border: 1px solid #ddd; break-inside: avoid; }
}

/* ═══════ ACCESSIBILITY ══════════════════ */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}

:focus-visible {
    outline: 2px solid var(--k-primary);
    outline-offset: 2px;
    border-radius: 4px;
}

/* Screen reader only */
.k-sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0,0,0,0);
    white-space: nowrap;
    border: 0;
}