:root {
    --color-primary: #38bdf8;
    --color-secondary: #818cf8;
    --color-accent: #f472b6;
    --color-success: #34d399;
    --color-warning: #fbbf24;
    --color-error: #f87171;
    --color-base-100: #1e293b;
    --color-base-200: #111827;
    --color-base-300: #0b0f19;
    --color-base-content: #f8fafc;
}

* {
    box-sizing: border-box;
}

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

body {
    position: relative;
    overflow-x: hidden;
    color: var(--color-base-content);
    font-family: 'Manrope', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--color-base-300);
}

button,
input,
select {
    font: inherit;
}

.ambient {
    position: fixed;
    z-index: 0;
    width: 32rem;
    height: 32rem;
    border-radius: 9999px;
    filter: blur(120px);
    opacity: 0.16;
    pointer-events: none;
    transform: translateZ(0);
}

.ambient-one {
    top: -8rem;
    left: -8rem;
    background: radial-gradient(circle, var(--color-primary), transparent 70%);
}

.ambient-two {
    right: -8rem;
    bottom: 5%;
    background: radial-gradient(circle, var(--color-secondary), transparent 70%);
}

.logo-mark {
    display: inline-flex;
    width: 2.25rem;
    height: 2.25rem;
    align-items: center;
    justify-content: center;
    border: 1px solid color-mix(in oklab, var(--color-primary) 35%, transparent);
    border-radius: 0.85rem;
    background: linear-gradient(135deg, color-mix(in oklab, var(--color-primary) 20%, transparent), color-mix(in oklab, var(--color-secondary) 15%, transparent));
    color: var(--color-primary);
    font-size: 0.85rem;
    font-weight: 800;
    letter-spacing: -0.04em;
}

.profile-segmented-control {
    display: inline-flex;
    align-items: center;
    padding: 0.2rem;
    border: 1px solid color-mix(in oklab, var(--color-base-content) 12%, transparent);
    border-radius: 9999px;
    background: color-mix(in oklab, var(--color-base-200) 90%, transparent);
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.3);
    gap: 0.15rem;
}

.profile-segment-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.3rem 0.75rem;
    border: 1px solid transparent;
    border-radius: 9999px;
    background: transparent;
    color: color-mix(in oklab, var(--color-base-content) 55%, transparent);
    font-size: 0.75rem;
    font-weight: 800;
    cursor: pointer;
    transition: all 180ms cubic-bezier(0.2, 0.8, 0.2, 1);
    user-select: none;
    line-height: 1;
}

@media (min-width: 640px) {
    .profile-segment-btn {
        padding: 0.35rem 0.9rem;
        font-size: 0.825rem;
    }
}

.profile-segment-btn:hover:not(.is-active) {
    color: var(--color-base-content);
    background: color-mix(in oklab, var(--color-base-content) 6%, transparent);
}

.profile-segment-btn.is-active {
    border-color: var(--color-primary);
    background: var(--color-primary);
    color: var(--color-base-300);
    box-shadow: 0 2px 10px -1px color-mix(in oklab, var(--color-primary) 50%, transparent);
    transform: scale(1.02);
}

.profile-avatar {
    font-size: 0.85rem;
    line-height: 1;
}

.text-gradient {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hide-scrollbar {
    scrollbar-width: none;
}

.hide-scrollbar::-webkit-scrollbar {
    display: none;
}

.workout-panel {
    isolation: isolate;
}

/* ==========================================================================
   DAY TABS GRID — Full-width 7-day segmented bar
   ========================================================================== */

.day-tabs-grid {
    display: grid;
    grid-template-columns: repeat(7, minmax(0, 1fr));
    gap: 0.35rem;
    width: 100%;
}

@media (min-width: 640px) {
    .day-tabs-grid {
        gap: 0.6rem;
    }
}

.day-tab-btn {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 2.75rem;
    padding: 0.35rem 0.15rem;
    border: 1px solid color-mix(in oklab, var(--color-base-content) 10%, transparent);
    border-radius: 0.95rem;
    background: color-mix(in oklab, var(--color-base-200) 85%, transparent);
    color: color-mix(in oklab, var(--color-base-content) 65%, transparent);
    font-size: 0.775rem;
    font-weight: 800;
    cursor: pointer;
    transition: all 160ms cubic-bezier(0.2, 0.8, 0.2, 1);
    user-select: none;
}

@media (min-width: 640px) {
    .day-tab-btn {
        min-height: 3.25rem;
        font-size: 0.875rem;
        border-radius: 1.15rem;
    }
}

.day-tab-btn:hover {
    border-color: color-mix(in oklab, var(--color-primary) 35%, transparent);
    background: color-mix(in oklab, var(--color-base-100) 80%, transparent);
    color: var(--color-base-content);
    transform: translateY(-1px);
}

.day-tab-btn.is-selected {
    border-color: var(--color-primary);
    background: var(--color-primary);
    color: var(--color-base-300);
    box-shadow: 0 4px 16px -2px color-mix(in oklab, var(--color-primary) 45%, transparent);
    transform: scale(1.02);
    z-index: 2;
}

.day-tab-btn.is-today:not(.is-selected) {
    border-color: color-mix(in oklab, var(--color-primary) 40%, transparent);
    background: color-mix(in oklab, var(--color-primary) 10%, var(--color-base-200));
    color: var(--color-primary);
}

.day-tab-name {
    line-height: 1;
}

.day-tab-today-badge {
    position: absolute;
    bottom: 0.22rem;
    display: inline-block;
    width: 0.3rem;
    height: 0.3rem;
    border-radius: 9999px;
    background: var(--color-primary);
}

.day-tab-btn.is-selected .day-tab-today-badge {
    background: var(--color-base-300);
}

/* ==========================================================================
   EXERCISE CARD — Mobile-first & Desktop-refined
   ========================================================================== */

.exercise-card {
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
    padding: 1rem 1.15rem;
    border: 1px solid color-mix(in oklab, var(--color-base-content) 9%, transparent);
    border-radius: 1.25rem;
    background: color-mix(in oklab, var(--color-base-100) 60%, transparent);
    transition: border-color 180ms ease, background 180ms ease, opacity 180ms ease, transform 180ms ease, box-shadow 180ms ease;
}

.exercise-card:hover {
    border-color: color-mix(in oklab, var(--color-primary) 35%, transparent);
    background: color-mix(in oklab, var(--color-base-100) 80%, transparent);
    box-shadow: 0 8px 24px -6px rgba(0, 0, 0, 0.3);
}

.exercise-card.is-complete {
    border-color: color-mix(in oklab, var(--color-success) 28%, transparent);
    background: color-mix(in oklab, var(--color-success) 6%, var(--color-base-100));
}

.exercise-card.is-saving {
    opacity: 0.65;
}

/* Top row: Checkbox + Number + Title */
.exercise-top-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    width: 100%;
}

.exercise-checkbox-wrap {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.exercise-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.85rem;
    height: 1.85rem;
    border-radius: 0.65rem;
    background: color-mix(in oklab, var(--color-base-content) 6%, transparent);
    color: color-mix(in oklab, var(--color-base-content) 45%, transparent);
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.04em;
    flex-shrink: 0;
}

.exercise-card.is-complete .exercise-number {
    background: color-mix(in oklab, var(--color-success) 18%, transparent);
    color: var(--color-success);
}

.exercise-title-wrap {
    min-width: 0;
    flex: 1;
}

.exercise-name {
    margin: 0;
    font-size: 0.975rem;
    font-weight: 800;
    line-height: 1.35;
    word-break: break-word;
    transition: color 180ms ease;
}

.exercise-card.is-complete .exercise-name {
    color: color-mix(in oklab, var(--color-base-content) 45%, transparent);
    text-decoration: line-through;
}

/* Meta row: Badges + Info Button (Left) & Weight Input (Right) */
.exercise-meta-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.65rem;
    width: 100%;
    padding-top: 0.65rem;
    border-top: 1px solid color-mix(in oklab, var(--color-base-content) 6%, transparent);
}

.exercise-tags {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.45rem;
}

.prescription-badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.65rem;
    border: 1px solid color-mix(in oklab, var(--color-primary) 30%, transparent);
    border-radius: 9999px;
    background: color-mix(in oklab, var(--color-primary) 10%, transparent);
    color: var(--color-primary);
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.02em;
    white-space: nowrap;
}

.btn-info-toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.25rem 0.6rem;
    border: 1px solid color-mix(in oklab, var(--color-base-content) 12%, transparent);
    border-radius: 9999px;
    background: color-mix(in oklab, var(--color-base-300) 75%, transparent);
    color: color-mix(in oklab, var(--color-base-content) 75%, transparent);
    font-size: 0.72rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 160ms ease;
    white-space: nowrap;
}

.btn-info-toggle:hover {
    border-color: var(--color-primary);
    background: color-mix(in oklab, var(--color-primary) 15%, transparent);
    color: var(--color-primary);
}

.btn-info-toggle.is-active {
    border-color: var(--color-primary);
    background: var(--color-primary);
    color: var(--color-base-300);
    box-shadow: 0 0 12px color-mix(in oklab, var(--color-primary) 40%, transparent);
}

/* Weight input box */
.weight-field {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    flex-shrink: 0;
}

.weight-input-container {
    display: inline-flex;
    align-items: center;
    width: 6.2rem;
    padding: 0.2rem 0.5rem;
    border: 1px solid color-mix(in oklab, var(--color-base-content) 12%, transparent);
    border-radius: 0.75rem;
    background: color-mix(in oklab, var(--color-base-300) 85%, transparent);
    transition: border-color 160ms ease, box-shadow 160ms ease;
}

.weight-input-container:focus-within {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 2px color-mix(in oklab, var(--color-primary) 25%, transparent);
}

.weight-input {
    width: 100%;
    border: none;
    background: transparent;
    color: var(--color-base-content);
    font-size: 0.85rem;
    font-weight: 800;
    text-align: right;
    outline: none;
}

.weight-input::placeholder {
    color: color-mix(in oklab, var(--color-base-content) 30%, transparent);
    font-weight: 600;
}

.weight-unit {
    margin-left: 0.25rem;
    color: color-mix(in oklab, var(--color-base-content) 45%, transparent);
    font-size: 0.68rem;
    font-weight: 800;
    text-transform: uppercase;
}

/* Expandable instructions panel */
.exercise-instructions {
    display: none;
    margin-top: 0.15rem;
    padding: 0.85rem 1rem;
    border: 1px solid color-mix(in oklab, var(--color-primary) 22%, transparent);
    border-radius: 0.95rem;
    background: color-mix(in oklab, var(--color-base-300) 90%, transparent);
    font-size: 0.825rem;
    line-height: 1.55;
    animation: fadeInSlide 200ms ease forwards;
}

.exercise-instructions.is-visible {
    display: block;
}

@keyframes fadeInSlide {
    from {
        opacity: 0;
        transform: translateY(-4px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Desktop layout enhancement (>= 768px) */
@media (min-width: 768px) {
    .exercise-card {
        padding: 1.15rem 1.35rem;
    }

    .exercise-name {
        font-size: 1.05rem;
    }

    .exercise-meta-row {
        padding-top: 0.75rem;
    }

    .weight-input-container {
        width: 6.75rem;
    }
}

/* ==========================================================================
   OTHER COMPONENTS
   ========================================================================== */

.warmup-step {
    display: flex;
    align-items: flex-start;
    gap: 0.85rem;
    padding: 0.75rem 0.95rem;
    border: 1px solid color-mix(in oklab, var(--color-base-content) 7%, transparent);
    border-radius: 1rem;
    background: color-mix(in oklab, var(--color-base-100) 50%, transparent);
}

.warmup-step-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.75rem;
    height: 1.75rem;
    border-radius: 0.5rem;
    background: color-mix(in oklab, var(--color-primary) 15%, transparent);
    color: var(--color-primary);
    font-size: 0.75rem;
    font-weight: 800;
    flex-shrink: 0;
}

.metric-card {
    display: flex;
    min-height: 6.25rem;
    flex-direction: column;
    justify-content: space-between;
    padding: 1.1rem;
    border: 1px solid color-mix(in oklab, var(--color-base-content) 7%, transparent);
    border-radius: 1.25rem;
    background: color-mix(in oklab, var(--color-base-100) 50%, transparent);
}

.metric-card.col-span-2 {
    min-height: auto;
}

.metric-value {
    font-size: 1.75rem;
    font-weight: 800;
    line-height: 1.1;
}

.metric-label {
    color: color-mix(in oklab, var(--color-base-content) 45%, transparent);
    font-size: 0.75rem;
    font-weight: 700;
}

.weekly-chart {
    display: grid;
    grid-template-columns: repeat(8, minmax(0, 1fr));
    align-items: end;
    gap: 0.45rem;
    height: 8.5rem;
    padding-top: 0.75rem;
}

.chart-column {
    display: flex;
    height: 100%;
    flex-direction: column;
    align-items: center;
    justify-content: end;
    gap: 0.4rem;
}

.chart-value,
.chart-label {
    color: color-mix(in oklab, var(--color-base-content) 40%, transparent);
    font-size: 0.62rem;
    font-weight: 700;
}

.chart-track {
    display: flex;
    width: 100%;
    height: 5.25rem;
    align-items: end;
    justify-content: center;
}

.chart-bar {
    width: 0.95rem;
    min-height: 0.35rem;
    border-radius: 999px;
    background: linear-gradient(180deg, var(--color-secondary), var(--color-primary));
    box-shadow: 0 -4px 18px color-mix(in oklab, var(--color-primary) 20%, transparent);
    transition: height 400ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.progression-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.85rem 0.95rem;
    border: 1px solid color-mix(in oklab, var(--color-base-content) 7%, transparent);
    border-radius: 1rem;
    background: color-mix(in oklab, var(--color-base-100) 45%, transparent);
}

@keyframes pin-shake {
    0%, 100% { transform: translateX(0); }
    20%, 60% { transform: translateX(-8px); }
    40%, 80% { transform: translateX(8px); }
}

.input-error {
    animation: pin-shake 300ms ease-in-out;
    border-color: var(--color-error) !important;
}

@media (max-width: 640px) {
    .ambient {
        width: 18rem;
        height: 18rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
    }
}